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Journal Articles

Improved Gas Chromatography/Mass Spectrometry Analysis of Barbiturates in Urine Using Centrifuge-Based Solid-Phase Extraction, Methylation, with d 5 -Pentobarbital as Internal Standard

RH Liu, Ph.D., AM McKeehan, B.A., C Edwards, M.S.F.S., G Foster, B.A., WD Bensley, B.S., JG Langner, B.S., AS Walia, Ph.D.
Journal: Journal of Forensic Sciences
Publisher: ASTM International
Article Type: Research-Article
J. Forensic Sci.. November 1994, 39(6): 1504–1514.
https://doi.org/10.1520/JFS13737J
Published Online: November 1, 1994
View Articletitled, Improved Gas Chromatography/Mass Spectrometry Analysis of Barbiturates in Urine Using Centrifuge-Based Solid-Phase Extraction, Methylation, with d 5 -Pentobarbital as Internal Standard
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Journal Articles

Evaluation of Enzyme Immunoassay Performance Characteristics—Phencyclidine Example

MJ Fyfe, Ph.D., P Chand, Ph.D., C McCutchen, B.S., JS Long, B.S., AS Walia, Ph.D., C Edwards, B.S., RH Liu, Ph.D.
Journal: Journal of Forensic Sciences
Publisher: ASTM International
Article Type: Technical Notes
J. Forensic Sci.. January 1993, 38(1): 156–164.
https://doi.org/10.1520/JFS13389J
Published Online: January 1, 1993
View Articletitled, Evaluation of Enzyme Immunoassay Performance Characteristics—Phencyclidine Example
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Journal Articles

Simultaneous Analysis of Amphetamine, Methamphetamine, and 3,4-Methylenedioxymethamphetamine (MDMA) in Urine Samples by Solid-Phase Extraction, Derivatization, and Gas Chromatography/Mass Spectrometry

BK Gan, B.S., D Baugh, M.S.F.S., RH Liu, Ph.D., AS Walia, Ph.D.
Journal: Journal of Forensic Sciences
Publisher: ASTM International
Article Type: Research-Article
J. Forensic Sci.. September 1991, 36(5): 1331–1341.
https://doi.org/10.1520/JFS13155J
Published Online: September 1, 1991
View Articletitled, Simultaneous Analysis of Amphetamine, Methamphetamine, and 3,4-Methylenedioxymethamphetamine (MDMA) in Urine Samples by Solid-Phase Extraction, Derivatization, and Gas Chromatography/Mass Spectrometry
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Journal Articles

Simultaneous Gas Chromatography/Mass Spectrometry Assay of Methadone and 2-Ethyl-1, 5-Dimethyl-3,3-Diphenylpyrrolidine (EDDP) in Urine

LD Baugh, M.S.F.S., RH Liu, Ph.D., AS Walia, Ph.D.
Journal: Journal of Forensic Sciences
Publisher: ASTM International
Article Type: Technical Notes
J. Forensic Sci.. March 1991, 36(2): 548–555.
https://doi.org/10.1520/JFS13057J
Published Online: March 1, 1991
View Articletitled, Simultaneous Gas Chromatography/Mass Spectrometry Assay of Methadone and 2-Ethyl-1, 5-Dimethyl-3,3-Diphenylpyrrolidine (EDDP) in Urine
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Journal Articles

Evaluation of Immunoassay Methods for the Screening of Cocaine Metabolites in Urine

LD Baugh, M.S.F.S., E Ellen Allen, M.S.F.S., RH Liu, Ph.D., JG Langner, B.S., JC Fentress, SC Chadha, LF Cook, M.A., AS Walia, Ph.D.
Journal: Journal of Forensic Sciences
Publisher: ASTM International
Article Type: Research-Article
J. Forensic Sci.. January 1991, 36(1): 79–85.
https://doi.org/10.1520/JFS13008J
Published Online: January 1, 1991
View Articletitled, Evaluation of Immunoassay Methods for the Screening of Cocaine Metabolites in Urine
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Journal Articles

Isotopic Analogue as the Internal Standard for Quantitative Determination of Benzoylecgonine: Concerns with Isotopic Purity and Concentration Level

RH Liu, Ph.D., L Diane Baugh, B.A., E Ellen Allen, M.S.F.S., SC Salud, B.S., JG Fentress, H Chadha, AS Walia, Ph.D.
Journal: Journal of Forensic Sciences
Publisher: ASTM International
Article Type: Research-Article
J. Forensic Sci.. July 1989, 34(4): 986–990.
https://doi.org/10.1520/JFS12725J
Published Online: July 1, 1989
View Articletitled, Isotopic Analogue as the Internal Standard for Quantitative Determination of Benzoylecgonine: Concerns with Isotopic Purity and Concentration Level
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